To confirm your exchange server build number, please follow the instructions below
Get-ExchangeServer | fl name,edition,admindisplayversion
(note that the command will give you version of Exchange and service pack installed. It won’t give you rollup version
You can run this command to view rollup version on each server
gcm exsetup | fl
IF you have Logparser, you can also use this command:
LogParser “SELECT Name,Size, FileVersion,ProductVersion,InternalName,ProductName FROM ‘servername1c$Program FilesMicrosoftExchange ServerV14BinExSetup.exe’,’servername2c$Program FilesMicrosoftExchange ServerV14BinExSetup.exe'” -recurse:0 -i:FS -o:NAT -rtp:-1
Reference:
Ex-Shell 